【Qt】QTcpServer/QTcpSocket通信

1.pro文件

QT       += network

2.服务器

h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QTcpServer>
#include <QTcpSocket>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_setListenButton_clicked();void on_sendMsgButton_clicked();private:Ui::MainWindow *ui;QTcpServer *tcpServer;QTcpSocket *tcpSocket;
};
#endif // MAINWINDOW_H

cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);ui->portEdit->setText("8899");setWindowTitle("服务器");// 创建监听服务器的对象tcpServer = new QTcpServer(this);connect(tcpServer,&QTcpServer::newConnection,this, [=](){tcpSocket = tcpServer->nextPendingConnection(); // 有新的客户端连接，得到一个用于通信的服务器对象ui->statusLabel->setText("已连接");// 检测是否可以接收数据connect(tcpSocket,&QTcpSocket::readyRead,this,[=](){QByteArray data = tcpSocket->readAll(); // data为client发来的数据ui->recordEdit->append("客户端：" + data);});connect(tcpSocket,&QTcpSocket::disconnected,this,[=](){tcpSocket->close();tcpSocket->deleteLater();ui->statusLabel->setText("未连接");ui->setListenButton->setDisabled(false);});});
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_setListenButton_clicked()
{unsigned short port = ui->portEdit->text().toUShort();tcpServer->listen(QHostAddress::Any, port); // 监听portui->setListenButton->setDisabled(true);
}void MainWindow::on_sendMsgButton_clicked()
{QString msg = ui->messageEdit->toPlainText();tcpSocket->write(msg.toUtf8());ui->recordEdit->append("服务器：" + msg);
}

3.客户端

h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QTcpSocket>
#include <QHostAddress>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_sendMsgButton_clicked();void on_connectButton_clicked();void on_disconnectButton_clicked();private:Ui::MainWindow *ui;QTcpSocket *tcpSocket;
};
#endif // MAINWINDOW_H

cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);ui->portEdit->setText("8899");ui->ipEdit->setText("127.0.0.1");setWindowTitle("客户端");ui->disconnectButton->setDisabled(true);// 创建监听服务器的对象tcpSocket = new QTcpSocket();connect(tcpSocket,&QTcpSocket::readyRead,this,[=](){QByteArray data = tcpSocket->readAll(); // data为client发来的数据ui->recordEdit->append("服务器：" + data);});connect(tcpSocket,&QTcpSocket::disconnected, this, [=](){tcpSocket->close();tcpSocket->deleteLater();ui->statusLabel->setText("未连接");ui->recordEdit->append("断开连接");ui->connectButton->setDisabled(false);ui->disconnectButton->setEnabled(false);});connect(tcpSocket,&QTcpSocket::connected, this, [=](){ui->statusLabel->setText("已连接");ui->recordEdit->append("连接成功");ui->connectButton->setDisabled(true);ui->disconnectButton->setEnabled(true);});}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_sendMsgButton_clicked()
{QString msg = ui->messageEdit->toPlainText();tcpSocket->write(msg.toUtf8());ui->recordEdit->append("客户端：" + msg);
}void MainWindow::on_connectButton_clicked()
{QString ip = ui->ipEdit->text();unsigned short port = ui->portEdit->text().toUShort();tcpSocket->connectToHost(QHostAddress(ip), port);
}void MainWindow::on_disconnectButton_clicked()
{tcpSocket->close();ui->connectButton->setDisabled(false);ui->disconnectButton->setEnabled(false);
}